Siloxane polymers for soil-repellent and soil-release textile finishes

ABSTRACT

FLUOROCARBON SILANES ARE COPOLYMERIZED WITH SILANES WHICH CONTAIN TWO OR MORE ALKYLENEOX GROUPS. THE COPOLYMERS ARE USEFUL FOR APPLICATION TO FIBROUS MATERIALS TO PROVIDE BOTH SOIL REPELLENCY AND SOIL RELEASABILITY.

United States Patent [191 Pittman et a1.

SILOXANE POLYMERS FOR SOIL-REPELLENT AND SOIL-RELEASE TEXTILE FINISHES lnventors: Allen G. Pittman, El Cerrito;

William L. Wasley, Berkeley, both of Calif.

Assignee: The United States of America as represented by the Secretary 01' Agriculture Filed: June 28, 1971 Appl. No.: 157,759

Related US. Application Data Division of Ser. No. 38,899, May 19, 1970, Pat. No.

US. Cl...... 260/46.5 Y, 117/121, 117/138.8 A, 117/139.5 A, 117/141, 117/143 A, 260/18 S, 260/33.8 SB, 260/46.5 R, 260/46.5 E,

v 260/448.2 B Int. Cl. C081 11/04 Field of Search 260/46.5 R, 46.5 E,

Primary Examiner-Donald E. Czaja Assistant Examiner-Melvyn I. Marquis Attorney-R. Hoffmanv et a1.

[5 7 ABSTRACT Fluorocarbon silanes are copolymerized with silanes which contain two or more alkyleneoxy groups. The copolymers are useful for application to fibrous materials to provide both soil repellency and soil releasability.

9 Claims, No Drawings SILOXANE POLYMERS FOR SOIL-REPELLENT AND SOIL-RELEASE TEXTILE FINISHES This application is a division of Ser. No. 38,899, filed May 19, 1970, now U.S. Pat. No. 3,639,156.

A non-exclusive, irrevocable, royalty-free license in the invention herein described, throughout the world for all purposes of the United States Government, with the power to grant sub-licenses for such purposes, is hereby granted to the Government of the United States of America.

This invention relates to and has among its objects the provision of novel polymers which are particularly useful for imparting soil-repellent and soil-release properties to fibrous materials. The objects of the invention. also include procedures for treating fibrous materials with the polymers, and the treated materials as new articles of manufacture. Further objects of the invention will be evident from the following description wherein parts and percentages are by weight unless otherwise specified.

It is not generally realized that maintaining textiles in a clean state involves two different properties of the textile. One is soil repellency, that is, the ability of thetextile to resist staining when it is contacted with gravy, butter, grease, or other oily substances. The other is soil releasability. Assuming that a textile has become stained, this property concerns the ease or difficulty of washing out the stains. The soil repellency and soil releasability characteristics of a given textile depend on the kind of fiber from which it is made and the kind of finishing agent which has been applied to it. Natural fibers such as cotton and wool exhibit little soil repe1- lency, but on the other hand when they do become soiled they are readily cleaned, that is, they exhibit a high level of soil releasability. Some of the synthetics, notably polyesters, not only exhibit a low level of soil repellency but also a low level of soil releasability. Thus, the modern trend toward fabricating textiles from blends of cotton or wool with polyesters has aggravated the situation because such blends are easily soiled and the absorbed soil is difficult to wash out. The application of resins for providing durable press properties still further aggravates the soil release situation. Almost everyone has encountered a situation where a so-called wash-and-wear garment of resin-treated cotton/polyester or wool/polyester blended material has become soiled by contact with an oily substance, and it is found that it takes repeated washings to remove the stains. In efforts to circumvent these problems, fluorocarbon polymers have been applied to the textiles. Be-

cause of the oleophobic properties of most fluorocar-- bons, such treatments do enhance the soil repellence of the fabric. However, they tend to make the soil release properties even worse because the aqueous washing medium cannot properly wet the fabric, hence cannot remove stains. Another remedy has been to apply bydrophilic materials, generally polymeric, to the textiles. These generally make it easierto wash out stains, but they do not enhance the ability of the textile to resist staining when contacted with oily substances.

A particular object of the invention is to provide the means for alleviating the problems outlined above. The invention provides polymers which confer oil repeldoes become stained, the stains can be readily washed out. Another advantage is that these polymers confer anti-static properties on the fabric to which they are applied.

The polymers having thisdesirable combination of properties are copolymerization products of at least two different monomers, one imparting oleophobic properties, the other hydrophilic properties. More specifically, the oleophobic monomer is a silane which THE OLEOPl-IOBIC MONOMER Generically, the oleophobic monomer used in accordance with the invention has the structure wherein:

R, is perfluoroalkyl group containing 3 to 18 perfluorinated carbon atoms. This perfluoroalkyl group can be of an open-chain (acyclic) configuration, straight or branched. Alternatively, it may be of a cyclic structure such as a perfluorocyclohexyl group, or it may be a combination of acyclic and cyclic structures. Generally, theacyclic structures are preferred.

Z is a divalent bridging group linked to a carbon of R; and a carbon of (CH- such as an ester (CO or SO; an ether (O- CH- SO. or S-), an amine ((CH ),-NR'-), or an amide (CONR- or SO NR) group, wherein s is an integer from 1 to 6 and R is hydrogen or a lower alkyl radical.

R is a member of the group consisting of hydrogen, monovalent hydrocarbon radicals, and monovalent halo-hydrocarbon radicals. Examples of R are hydrogen; an alkyl radical such as methyl, ethyl, isopropyl, butyl, cyclohexyl, dodecyl, etc.; an aryl radical such as phenyl, tolyl, ethylphenyl, isopropylphenyl, xylyl, xenyl, naphthyl, etc. an aralkyl radical such as benzyl or 2-phenylethyl; or a halogenated hydrocarbon radical such as 2-chloroethyl, trifluoromethyl, 3-chloropropyl, 2,2,2-trifluoroethyl, 4-chloro- (or fluoro-) cyclohexyl,

' p-chloro- (or bromoor fluoro-) phenyl, and the like.

lence on fabrics so that they strongly resist staining,

e.g., by oily foods or the like. Concomitantly, these polymers confer soil-release properties on the fabric to which they are applied. This means that if the fabric Y is a member of the group consisting of halogen, alkoxy, aroxy, and acyloxy. For example, Y may be a halogen such as fluorine, chlorine, bromine, or iodine; an alkoxy radical such as methoxy, ethoxy, propoxy, isopropoxy, butoxy, cyclohexyloxy, or the like; an aroxy radical such as phenoxy, toloxy, ethylphenoxy, isopropylphenoxy, or the like, or an acyloxy radical such as acetoxy, propionoxy, butyroxy, or the like.

a is an inter from 0 to l.

b is an integer from 1 to l2.

n is an integer from 1 to 2.

p is an integer from 1 to 3.

q is'an integer from O to 2, and the sum of n, p, and q is' 4.

In the preferred compounds there is more than one hydrolyzable group (Y), i.e., p has'the value 2 or 3.

These monomers are known in the art and described in the literature, for example, in US. Pats. Nos. 3,012,006, 3,422,131, and 3,423,234. Examples of individual monomers are given below by way of illustration, not limitation:

Of particular interest are the monomers wherein R, is the heptafluoroisopropyl radical since this group provides a degree of oleophobicity equivalent to six or seven fluorinated carbons in a straight chain. Monomers of this category are disclosed in our US. Pat. No. 3,422,131 and include compounds of the structure wherein: I

m is an integer from 2 to 3, and the other symbols are as in Formula 1, namely: 1

R is a member of the group consisting of hydrogen, monovalent hydrocarbon radicals, and monovalent halohydrocarbon radicals.

Y is a member of the group consisting of halogen, alkoxy, aroxy, and acyloxy.

n is an integer from 1 to 2.

p is an integer from 1 to 3.

q is an integer from to 2, and the sum of n, p, and q is 4.

Examples of individual monomers in this subcategory are listed below by way of illustration, not limitation.:

THE HYDROPHILI C MONOMER 6 One category of hydrophilic monomers used in ac- 5 cordance with the invention has the structure wherein:

R" is a monovalent hydrocarbon radical containing one to 20 carbon atoms and which may be in an alkyl, aryl, or aralkyl configuration. The nature of the hydrocarbon substituent R" is of no criticality; it simply serves as an inert terminator of the alkyleneoxy chain.

Alk is an alkylene group containing two to six carbon atoms.

x is an integer from 2 to 100.

R is a divalent linking radical selected from the c is an integer from O to 2.

d is an integer from 1 to 3, and the sum of c and d is 3 and convert this into the corresponding allyl (or methallyl) ether by reaction with allyl (or methallyl) bromide in the presence of a base. This'intermediate is then reacted with a silane containing hydrogen attached to the silicon atom, for example, trichlorosilane, dichlorosilane, methyl dichlorosilane,'or other silane of the formula wherein R, Y, c, and d are as above defined. The reaction is generally carried out in the presence of a catalyst such as chloroplatinic acid and results in addition of the silane to the unsaturated group of the allyl (or methallyl ether). The synthesis is illustrated'by the following equations:

In the event that a methallyl halide is used in the first step, the final product is Where it is desired to produce monomers containing an ester linkage (i.e., where R' is CO--CH(CH or CO-C(CH the synthesis is varied in the first step by esterifying the monoetherified polyethylencoxy glycol with acryloyl (or methacryloyl) chloride. In the next step, a hydrogen-containing silane is added to the intermediate as previously described-The synthesis is illustrated by the following formulas:

In the event the esterification is carried out with a methacrylic acid derivative the final product is CH: Y

Examples of individual monomers are provided below by way of illustration:

Another category of hydrophilic monomers used in accordance with the invention contains two silyl groups, and has the structure IV. R

wherein R, Y, RT", Alk, x, c, and d are as defined in Formula III; c'is an integer from 0 to 2, d is an integer from I to 3, and the sum ofc' and d is 3. R" is analogous to R in that it is a member of the group consisting Of CH2, and

In preparing the compounds shown in Formula IV the same procedures are applied as aforesaid except that the starting material is a polyoxyalkylene glycol containing two terminal hydroxyls. The synthesis is illustrated as follows:

Many of the polyoxyalkylene glycols available in commerce are mixtures of congeners with differing numbers of alkyleneoxy units. Such commercial mixtures are suitable as starting materials for the syntheses of the hydrophilic monomers (both those of Formula Ill and Formula IV). Among such mixtures are those wherein the average number of alkyleneoxy units is 2, 4, 6, 8, l0, l2, 14, 16, 20, 24, 30, or 40, for example.

PREPARATION OF THE COPOLYMERS The copolymers of the invention are prepared by conventional polymerizations used in preparing siloxane polymersQThis invoIves subjecting a mixture of the oleophobic and hydrophilic monomers to hydrolysis. For example, the monomer mixture is stirred with an excess of water, and then water and by-products are removed by evaporation. A preferred technique'involves dissolving the monomer mixture in a solvent such as acbrous materials to provide them with both soil repellency and soil releasability.

The structure of thecopolymers will vary depending on the nature of the monomers selected. For example, where the monomer of Formula I is copolymerized with the monomer of Formula ill, the copolymer will contain repeating units of the structure I applied to the fibrous material. The term dispersion Where the hydrophilic monomer selected is according '7 r to Formula IV, the copolymer will contain repeating units as shown in Formula V and repeating units of the structure As noted hereinabove, we prefer to use monomers (both oleophobic and hydrophilic) wherein each contains at least 2 hydrolyzable groups per silicyl group.

.Such monomers yield copolymers of greater molecular weight and which are capable of further polymerization-for example, after they are applied to a fibrous material and subjected to a curing operation. The

monomers containing a single hydrolyzable group are preferably used where it may be desired to limit the degree-of polymerization'and thus they may be used in conjunction with dior tri-functional monomers to act as chain stoppers.

In preparing the copolymers of the invention, the

proportions of the monomers may be varied depending on such factors as the number of perfluorinated carbon atoms in the oleophobic monomer, the number of alkyleneoxy groups in the hydrophilic monomer, and the properties desired in the copolymer. In general, the monomers are used in the ratio of about from 0.1 to 3 moles of the hydrophilic monomer per mole of the oleophobic monomer, with the proviso that the copolymer contain at least 10 percent fluorine by weight.

The copolymers of the invention encompass those which are. prepared by copolymerization of the elecphobic and hydrophilic monomers as above described plus one or more monomers which are different from both of the basic reactants. The additional monomer may be employed to modify the mechanical properties of the copolymer without materially affecting its ability to provide soil repellency and soil releasability, or to increase the adherence of the copolymer to fibrous Y substrates. Typically, the additional monomer may be dior tri-functional silanes such as methyldichlorosilane, dimethyldichlorosilane, methyltrichlorosilane,trichlorosilane, phenyldichlorosilane, tri-methoxysilane, or the like.

R ATM N QFFIBRQUS SUBSIR S The copolymers described herein are particularly useful for the treatment of fibrous materials,*such as textiles, to provide them with oil-, water-, and soilrepellency and further to improve their soil or stain release characteristics. In practicing this phase of the invention, a copolymer is prepared as described above and applied to the fibrous substrate. Typically, the copolymer is dispersed in a liquid carrier and in this form is used in a generic sense to include solutions, suspensions, and emulsions. Where the copolymer is to be applied in the form of a solution, it is dissolved in an inert hand of the textile. In fact, the hand is usually improved volatile solvent, e. g., benzotrifluoride, 1,3-bisare durable-they are retained despite laundering and trifluoromethyl benzene, or trichlorotrifluoroethane. dry-cleaning of the product. Alternatively, the copolymer is emulsified in water, The invention may be utilized for improving the with the aid of a conventional emulsifying agent. In any properties of all types of fibrous materials, for example, event, the resulting dispersion is applied to the fibrous paper; cotton; linen; hemp; jute; remie; sisal; cellulose material by a conventional di d d t h i B acetate rayons; cellulose acetate-butyrate rayons; savarying the concentration of the copolymer in the dis- Ponified acetate rayons; viscose rayons; cuprammo' persion and the degree of padding, the amount of co- Ilium y ethyl Cellulose; be prepared from amypolyrner deposited on the material may be varied. Typilose algina, P W001; Silk; animal half; mohalr; cally, the amount of copolymer may be from 0.1 to 20 leather; regenerated Protein fibers P p from percent, based on the weight of fibrous material but it casein, $y m Peanut Proteins lei", gluten egg albu' is obvious that higher or lower proportions can be used min, collagen, or keratinsi nylon; Polyurethane fibers; if desired. Usually, in treating textiles such as fabrics, Polyester fibers 'F as P y y P the amount of copolymer is limited to about 0.1 to 5 polyacl'ylonitrile'based fibers; fi f ofmPl'gamc percent to attain the desired repellency without interigin Such as asbestos, glass, The mvemlon may be ference i h h h d f h t il applied to textile materials which are in the form of After application of th copolymer di i the bulk fibers, filaments, yarns, threads slivers, roving, treated fibrous substrate is subjected to a conventional webbing cord W woven or kmtted fabncs felts curing peration in order to bond the polymer t the 01' other non-woven fabrics, garments Ol' garment parts. fibers. As an example of such treatment, the fibrous EXAMPLES material is heated in the range of about 50 to 150 C. v f a period f 5 to 60 minutes The solvent (f the The invention '18 further demonstrated by the followcopolymer dispersion) may be evaporated in a separate ing f f l Whlch are P i y y of lull-Fallon, step prior to curing or it may simply be evaporated durnot l'mtatmm ing the curing operation. In this curing operation the Test Methods uncondensed or unhydrolyzed groups in the uncu d The tests referred to in the examples were carried out copolymer (e.g., halo, alkoxy, or aroxy groups attached as d'escnbed below: to Si) react with reactive sites in the fibers, particularly Repellencyi The usediwas the AATC? Test sites which contain active hydrogen as in hydroxyl, pri- Method 1 2 Batmgs are from 8 f mary and secondary amide, thioh carboxyl, and like higher values signifying the greater resistance to or] groups. Many types of fibersfor example: wool, silk, pelletfatlon' In Partlcular, F 'f p f y ratmg 1s hair, and other proteinous fibers; cotton, rayons, and the b s tf test hquld whlch "P Y the other cellulosic fib nylon, polyurethane, and polyw fabric in within a penod of 30 seconds. The liquids and rea fiberscontain groups of this kind and therefore correspondmg numbers are: are particularly suitable substrates to obtain good f pq j bonding ofthe copolymer deposit. Moreover, virtually 40 g g u and mhcxadccane by VOL all fibrous materials, even inorganic products such as 3- n-hexadecan asbestos and glass fibers, contain moisture and during 2:325:32 the curing operation this moisture promotes additional 6 n-decane hydrolysis and condensation of unreacted Si-bonded- ::g::';: halo, alkoxy, or aroxy groups with the end result that r additional, in situ, polymerization occurs so that the co- Stain Release: Samples-of the fabrics are stained with polymer is durably fixed to the treated substrate. mineral oil, then washed and rated for stain release aclf it is desired to expedite the curing operation, a concording to AATCC Test Method 130-1969. Residual .ventional curing catalyst may be added to the polymer stain is rated on a scale from 5 to l by comparison with solution before application to the fibrous substrate or a standard stain release replicawhich displays a graduthe catalyst may be separately deposited on the subated series of stains. The highest number (5) indicates strate before or after application of the copolymer discomplete stain removal, whereas the lowest (1) indipersion. Typically, one may use such catalysts as zinc cates virtually no stain removal. octoate, dibutyltin diacetate or dilaurate, triethanol- The following oleophobic monomers were prepared amine titanate, triethanolamine zirconate, zirconium by known methods: acetate, zirconium oxychloride, zirconium or titanium esters of alkanols such as tetrabutyl titanate, zinc per- 5,113; 1 fluorobutyrate, etc. Monomer nation Preparatio Fibrous materials treated with the copolymers of the (CF3)2CF O(C HZ)3SiCl3 A Patent 3,422,131. invention display an enhanced resistance to becoming B Do, soiled and if they do become stained they can be (OF 3 2 2 3 1 2 readily cleaned. Moreover, these advantages are at- CFs(CFz)sCHzO(CHz)z-SiC13 0 Patent 3,012,006. tained without detriment to other properties of the tex- The following hydmphmc monomers were prepared tile. in particular, the treatment does not impair the d ibed i Exa l 1 5:

Code desig- Prepa- Mononier nation ration a C 2C 2 C zCH2 (CHz)aSiCl3 n Ex. 1. E Ex. 2.

(wherein g is approximately 12).

Monomer 7 Code desig- Prepanation ration CH CH:

Example Preparation of Monomer D The following reaction scheme was carried out in the preparation of Monomer D:

- NaH CH;CHzCH:0-CHz-CHz-OH l 200 ml. of p-dioxane, was added dropwise with stirring. The flask was cooled with ice water during the addition as considerable heat was evolved. Sodium bromidewas seen to precipitate fromthe mixture during the addition. After all the allyl bromide had been added, the reaction mixture was stirred overnight at room temperature. The reaction mixture was then filtered free from NaBr l l l. g. solid obtained), and the filtrate treated by first distilling off the dioxane at about 100 C. at atmospheric pressure and then distilling the product under vacuum. Seventy-eight grams of the allyl ether were obtained by distillation at about 73 C. at mm. Hg. pressure. 1

MonomerD was then prepared from the allyl ether as follows: .Three small, dry, Pyrex tubes sealed at one end were each charged with 2.8 g. of the allyl ether, 0.05 ml. t-butyl perbenzoate, and 3.1 ml. Cl Sil-l. The tubes were cooled in a Dry-ice bath, evacuated, sealed, and placed in a steam bath overnight. The contents of the tubes were then combined and distilled under vacuum to yield 10.4 g. of Monomer D, hp 1 l 16 C. at approximately 1 mm. Hg. 3

Example 2 Preparation of Monomer E CI-l O-(CH,-CH ,-O),-(CH -SiCl v(,g is approximately 12) This monomer was prepared in a manner similar to that described in Example 1, using (for the preparation of the allyl ether) the following materials:

(wherein g is approximately 12) 21 goof 50% active NaH in mineral oil 300 ml. p-dioxane (solvent) 100 g. allyl bromide (excess) In preparing the allyl ether, the reaction mixture was heated at C. for 24 hours rather than held overnight at room temperature.

In the next stage of the synthesis, the following ingredients were placed in a dry, 60-ml., glass vessel:

23 g. of the allyl ether (0.04 mole) 0.15 ml. t-butyl perbenzoate 6.2 ml. Cl SiH (0.06 mole) The vessel was sealed and placed in a steam bath overnight. Then the liquid product was heated under reduced pressure to remove unrea'cted trichloresilane. About 2.5 g. of unreacted Cl SiH was collected in a Dry-ice trap, indicating good product conversion. Infrared analysis of the product, Monomer E, did not show any vinyl absorption at 6.1 p. but did show bands at 13.2 and 14.4 p., which is typical of SiCl monomers. v

' Monomer E could be polymerized by adding it directly to water. 'A water-soluble product was formed which could be cured to an insoluble cross-linked rubher on removal of water and heating at 150 C. for ca. 30 minutes.

ene glycol was first prepared and followed by the addition of 2 moles of trichlorosilane.

In preparing the di-allyi ether the following chemicals 3 were employed:

84 g. of a 57 percent active Nal-lmineral oil dispersion 200 ml. dry dimethylformamide (solvent) 158 g. of triethylene glycol dissolved in m1. of dry dimethylforr'namide 2 moles of allyl bromide dissolved in 200 ml. of pdioxane After addition of the allyl bromide, the slurry was heated with stirring overnight at 60 C. The salt was removed by filtration and the filtrate distilled. A crude product was obtained in a yield of 163 grams, b.p. l30l45 C. at about 5 mm Hg. Analysis thereof showed the desired vinyl absorption but also some residual OH which was due either to unreacted triethylene glycol or mono-allyl ether. Accordingly, the crude product was treated with increments of a high molecular weight (MW 600) aliphatic di-isocyanate (General Mills DDl) to tie up residual OH-containing products. The di-isocyanate was added slowly, and the product checked from time to time until there wasno evidence of free NCO in the product. The reaction mixture was then distilled under vacuum to give the di-allyl ether product free from OH, b.p. ca. C. at 5 mm. Hg.

Addition of trichlorosilane to the diallyl ether was carried out as described in the preparation of Monomers E and F, by adding 2 molar equivalents of I-lSiCl to the diallyl ether in the presence of t-butyl perbenzoate catalyst.

Example 4 Preparation of Monomer G CH3 CH;

H (wherein g is approximately 12) This monomer was prepared in the samemanner as described for Monomers D and E except that the mono-hydroxy alcohol was a nonylphenoxy polyethylene glycol containing about 12 CH,-CI-I -0- units and instead of allyl bromide, methallyl chloride was used.

Addition of methyl dichlorosilane was carried out as before, in the presence of t-butyl pe rbenzoate.

Example 5 Preparation of Monomer H g. of 2,6-di-t-butyl p-cresol (polymerization inhibitor),'

12 ml. of l-lSiCl and. 0.2 m1. of a 0.00014 molar solution of l-l Ptcl -l-l Oin isopropanol.

Example 6 Preparation of Copolymers Copolymers were generally prepared by the co-= hydrolysis ofa mixture of the monomers, either by adding the mixture to water with vigorous stirring or, preferably, by first dissolving the mixture in a solvent such as acetone, p-dioxane, tetrahydrofuran or other solvent which is partially to completely miscible with water, then adding water to the monomer-solvent solution, and finally removing solvent under vacuum.

A. An example follows for the copolymerization of Monomers A and D: 2- ml. of Monomer A was mixed with 1 ml. of Monomer D, and the mixture added to 20 ml. of tetrahydrofuran. The solution was stirred and A ml. of water added. After about 1 hours, the mixture was placed on a steam bath to remove solvent. Residual solvent was removed in a vacuum oven at 80 C. at 1 mm. Hg. A clear, thick, homogenous liquid remained. This siloxane copolymer was soluble in a number of organic solvents, particularly fluorinated solvents such as benzotrifluoride and trichlorotrifluoromethane.

The liquid polymer could be converted into an insoluble, rubbery solid by heating. For example, heating at 150 C. for 10 minutes converted a thin layer of the liquid into a rubbery solid. A true copolymer existed since a mixture of the homopolymer of A and the homopolymer of D were incompatible and formed two insoluble layers on mixing.

A series of copolymers were prepared as described in paragraph A above:

Quantity of each Polymer Code Monomers used monomer, in ml. designation A and D 2/ l I A and D and HSiCl, 2/O.5/0.5 II A and E 2 1 III A and F 3/ I IV B and G and A lll/3 V 0.5/ lll VI CandI-IandA Polymer I, derived from Monomers A and D, contains recurrent units of the structures VIII. (CF CF-O-(CI-I,) -SiO,

and

Polymer V, derived from Monomers A, B, and G, contains recurrent units of the structure shown in Formula VIII plus CoHw (wherein g is approximately 12) Polymer VI, derived from Monomers A, C, and H, contains recurrent units of the structure shown in Formula VIII plus CF (CF2) e-CHz-O-(CHz) SiOr-5 and Example 7 Fabric Treatment The fabrics used in the treatments were a tri-blend of wool/cotton/nylon and a tri-blend of wool/rayonlpolyester.

Treatment of the fabrics with the-copolymers of the invention were carried out by immersing the fabrics in a solution of the copolymer in trichlorotrifluoroethane or l,3-bis-trifluoromethyl-benzene. In some cases the copolymer was applied as an aqueous emulsion. After immersion in the solution or emulsion, the fabrics were run through squeeze rolls to obtain a 50-60 percent wet pick-up. The treated fabrics were then air-dried and cured in an oven at l00l50 C. for 10-20 minutes. After removal from the oven and cooling to room temperature, the products were tested for oil repellency and for soil release as previously described. In some instances the fabrics, prior to application of the copolymers, were treated with dimethylol dihydroxyethylene urea (DMDEU) in order to impart durable press properties and to examine the effectiveness of the v 15 I copolymers'in the presence of this conventional finishing agent. The durable press fabrics were prepared as follows: A 20 percent aqueous solution of DMDEU containing approximately 0.5% Zn (N catalyst and 0.2 percent of a non-ionic detergent was prepared. Fabrics were immersed in this solution, then squeezed to a wet pick-up of 40-50 percent. The fabric swatches wereair-drieipressed forl minute on a high-heat (350 F'.) press and then cured in anoven at 325 F. for 15 minutes.

The following table summarizes the results of fabric treatment with the various copolymers described in Example 6.

In certain cases, the copolymers were applied as aqueous emulsions. A typical example of emulsification follows: Ten grams of copolymer III was dissolved in 10 ml. of benzotrifluoride. To this was added 50 mg. of a commercial wetting agent (lgepal' CO-530, a nonylphenoxy polyoxyethylene glycol containing 6 ethyleneoxy groups per molecule). This solution was added slowly to 80 ml. of water containing 50 mg. of a commercial wetting agent (lgepal CO-7 10, a nonylphenoxy polyoxyethylene glycol containing 12 ethyleneoxy groups per molecule) which was being stirred in a highspeed blender. The emulsion which resulted could be used as such or diluted further with water.

TABULATION OF RESULTS OF FABRIC TREATMENT Copolymer Cure Oil repellency Code No. and conditions .Be- Afconcentration Temp. fore ter Stain in solution Cfl'ime waswas release or emulsion min. Fabric hing hing rating 1, 2% sol. 1 10/10 W/C/N 3 2 and DMDEU 1, 2% sol; [/20 WlC/N/ 3 '2' 5 DMDEU ll, 2% sol. I l 10/20 W/R/P 5 4 5 and DMDEU Ill, l l 5 W/C/N 3 2 5 3% emul. IV, 3% Sol. l 10/30 W/C/N 2 2 4 V, 1% sol. 150/3 WIRIP 2 1 4 VI, 3% sol. 120/10 W/R/P 6 5 -4 5 and i DMDEU None W/C/N 0 0 2.5

' and DMDEU None W/C/N O 3.0 None WIR/P 0 0 2.0 None W/R/P 0 0 1.0 and DMDEU.

*W/C/N woollcotton/nylon, -W/R/lf wool/rayon/polyester,

DMEDU dimethylol dihydroxyethylene urea.

l-lereinabove we have described a series of hydrophilic monomers. These compounds may be formed into homopolymers by applying conventional hydrolytic polymerization techniques such as those described above. We have observed that these homopolymers may be applied to fibrous materials to improve their soil release properties, however, the results are not as good as those obtained by application of the aforesaid copolymers with olephobic monomers. Of course, the homopolymers do not provide any resistance to oily staining. Taking these items into consideration, the homopolymers of the hydrophilic monomers are useful in situations where it is desired to render a fibrous material hydrophilic. They also exert a softening effect on the substrate so that they are also useful for that purpose. In a practice of this aspect of the invention, .the homopolymers are applied to the fibrous substrate in the same manner as described above in connection with the copolymers, and subjected to the same curing step. The following examples illustrate the preparation of the homopolymers and their application to textile materials.

Example 8 Polymerization of Monomer D Example 9 Polymerization of Monomer E This monomer was polymerised by adding 1 ml. of

water to 5 ml. of the monomer dissolved in ml. of

also be converted to a cross-linked, rubbery, waterinsoluble film by heating above 100 C.

Example 10 Treatment of Textile The textile used in the following tests was a tri-blend fabric of wool/rayon/polyester which had been given a durable press treatment as follows: The fabric was immersed in a ZOpercentaqueous solution of dimethylol dihydroxyethylene urea containing 0.5 percent zinc nitrate catalyst and 0.2 percent of a non-ionic detergent. Following this the fabric was squeezed in a pad roll to a 60 percent wet pick-up, air-dried, pressed for l minute in a hot head press (350 F.), then oven-cured at 325 F. for 15 minutes.

An aqueous solution of polymerized Monomer E was prepared by adding 5 ml. of the monomer to ml. of water. After the addition, the solution was brought to neutrality by adding 1 N sodium hydroxide. A swatch of the fabric was immersed in this solution, squeezed to 60 percent wet pick-up, air-dried, and cured in an oven at 300 F. for 5 minutes.

The treated fabric and, as a control, a swatch of fabric which had not been treated with the polymer were then tested for stain releasability. To this end, the

swatches were stained with mineral oil, washed, and' rated for stain release according to AATCC Test Method -1969. Residual stain is rated on a scale from 5 to l by comparison with a standard stain-release replica which displays a graduated'series of stains. The highest number (5) indicates complete stain removal whereas the lowest (1) indicates virtually no stain re moval.

The results obtained were as follows: The sample treated with the polymer had a stain-release rating of 4, whereas the control had a rating of 1.5.

Having thus described our invention, we claim:

1. A siloxane copolymer which contains A. recurring units of the structure wherein: g g

R, is a perfluoroalkyl group containing 3 to 18 perfluorinated carbon atoms,

Z is a divalent bridging group linked to a carbon of R, and a carbon of (CH,),, and is selected from the group consisting of -CO S -0-, 2)r-' 2);

wherein: I

R is a monovalent hydrocarbon radical containing one to carbon atoms,

Alk is an alkylene group containing two to six carbon atoms,

x is an integer from 2 to 100,

R' is a divalent linking. radical selected from the group consisting of *CH -CH3CH2,

R is a member of the group consisting of hydrogen, monovalent hydrocarbon radicals, and monovalent halohydrocarbon radicals,

c is an integer from 0 to 2,

d is an integer from 1 to 3, and the sum of c and d is the ratio of said units being 0.1 to 3 moles of unit B per mole of unit A, with the proviso that the copolymer contain at least 10 percent fluorine by weight. 1 1

2. The copolymer of claim 1 wherein unit A has the structure 3. The copolymer of claim structure 4. The copolymer of claim 1 wherein unit A has the structure 5. The copolymer of claim 1 wherein unit B has the structure 1 wherein unit A has the 6. The copolymer of claim 1 wherein unit B has the structure wherein g is approximately 12.

8. The copolymer of claim 1 wherein unit B has the 5tm 9. A siloxane copolymer which contains vr in pn t f; hev tms ma m is an integer from 2 to 3,

R is a member of the group consisting of hydrogen, monovalent hydrocarbon radicals, and monovalent halohydrocarbon radicals,

n is an integer from 1 to 2,

p is an integer from 1 to 3,

q is an integer from O to 2, and the sum of n, p, and

q is 4, and

H li t syxs it ynitsq r o wt re u R"0-(Alk-O),R'Si

Od/z.

wherein:

R" is a monovalent hydrocarbon radical containing one to 20 carbon atoms,

Alk is an alkylene group containing two to six carbon atoms,

x is an integer from 2 to 100,

R' is a divalent linking radical selected from the group consisting of CH2.CH CI-l CH2CH(CH )CH COCH(CH .1304:QQ:Q( CHa2;TL W Y... v

R is a member of the group consisting of hydrogen, monovalent hydrocarbon radicals, and monovalent halohydrocarbon radicals,

c is an integer from O to 2,

d is an integer from 1 to 3, and the sum of c and d is 0 the ratio of said units being 0.1 to 3 moles of unit B per mole of unit A, with the proviso that the copolymer contain at least 10 percent fluorine by weight. 

